Paper box.



AL PATENTED "JAN', a1, 1905. 'fr.1iw Nf|.".z.

' lPAPER BOX., Immunol Hun nu 14, 1904.

IIIHIIIIIIIINIIHN f2 lIl Patented January 3i," 1905.

PATEK-i- OFFICE.

HENRY RUNTZ, OF CHICAGO, ILLINOIS.

PAPER Box.

SPECIFICATION forming part of Letters Patent No. 781,306, dated January 31 1905.

' Application mamey-14,1904. serrano. 207,989.

To whom, t may concern.:

Be it known that I, HENRY RUNTZ, a citizen of the United States, residing at Chicago, in

the county of Cook and Stateof Illinois, haveV invented certain new and .useful Improvements in Paper Boxes, of which the following is a description, reference being had to the accompanying drawings, forming a part of this specification, in which corresponding l-etters of reference in the different figures indicate like parts.

The object of my invention is to construct a paper box having a convex top without the use of molds or forms.

In the formation of paper boxes the tendency is for the top or bottom, or both, to become concave or to bend inwardly as soon as the outer covering of'paper is-applied to the cardboard or strawboard forming the body of the box. This is owing to the fact that in lining and covering the strawboard both sides are dampened with adhesive material, and inasmuch as a heavier and better material is used for the cover or outer finish than for the' lining the force exerted by the shrinkage of the former is greater than that of the latter, and hence the outer surface becomes concave box-body of comparatively heavy stock within another of lighter material, thereby doubling the walls of the box, lining the inner shell with the usual lining-paper, and preferably covering the outer shell with the usual covering-paper and so securing the inner plies which form the top, all of which is herel shell in place within the latter that it will serve as a form and support therefor without dampening vor placing any adhesive material upon the meeting faces of the two shells or -inafter more particularly described, and deli- Vsentsg'the main body of a box, which may be constructed in any well-known way or, if preferred, in the Way in which the improved top or cover portion is constructed, (represented generally byl o.) The latter embodies the principle of my invention and consists of a body portion o, Fig. 2, made fromany suitable material-such. for example, as strawf board-having a facing Z of paper pasted thereon to form a lining. The blank is then scored in the usual way, as shown at e, and bent so that the iianges or parts ff are parallel to each other, the corners being secured by reinforcements in any well-known way.

The tendency of the lining Z to shrink causes i the part c, forming the top, to bulge upwardly in convex form, as shown. An outer ply g kof'lighter stock is then made of size to fit or shell li, thereby making a two-ply box body, with no adhesive material between the plies 'which form the top. The result of this construction` is that the shapepof the outer conforms to that of the inner ply, which is alwaysmore or less convex. The 'convexity ofthe inn'ergply may, if desired, be considerably increased when the boxis formed and still damp by pressing it outwardly with the lingers; but this is not necessary unless a considerable degree of convexity is desired.

Iprefer to secure the two plies together merely by means of the inturned iiaps; but the same result may be accomplished by pasting the flanges of the two plies together, as indicated at j', Fig. 3, in which case the outer ply if formed from a well-finished material need not be covered.

It is obvious that the bottom of the box may be formed in the same manner; but inasmuch as it is not desirable to have the bottom otherwise than fiat I prefer to make it in the usual Way.

While more material is necessary in my improvement than is necessary in the ordinary construction, yet its cost is more than overbalanced by the extra labor necessary under the old methods.

Having thus described my invention, I claiml. A convex top for paper boxes having ,depending side and end iianges, said top cornprising a main or middle supporting-ply of relatively thick stock, an inner ply of thin stock secured to the inner face of said main supporting-ply by means oi" an adhesive material whereby the inner face of said supporting-ply is contracted to impart convexity to the opposite face, and a lcovering-ply litted over said main ply and secured only to the flanges of the latter.

2. A convex top for paper boxes including the top proper with integral side and end flanges, said top consisting of two shells, one inclosed within the other without adhesive material between the top portions thereoil and a lining secured to said inner shell by means of adhesive material to impart convexity thereto as a result of the shrinkage oi said lining.

In testimony whereof l have signed this speciiication, in the presence of two subscribing Witnesses, this 12th day of May, 1904.

HENRY RUNTZ.

Witnesses:

DAVID H. FLETCHER, CARRIE E. JORDAN. 

